微细腔内甲烷湿空气低温重整积炭特性的热力学分析

微细腔内重整积炭会引起催化剂失活和孔道堵塞，甲烷低温自热重整技术的提出，既有利于实现微燃烧器中甲烷的持续稳定燃烧，又能有效降低热点和减少积炭。通过热力学分析，探讨常压下反应温度低于973K时微细腔内自热重整积炭的影响因素及重整特性。结果表明,温度、空碳比及水碳比对积炭生成有重要影响。微细腔内积炭含量随温度升高先增大后减小；贫氧环境下，空碳比和水碳比的增加不仅对减少积炭有效，对氢气产生也有利；同时，甲烷自热重整系统与无水系统相比减碳性能优越。甲烷质量流量为6.6g/h、空碳比和水碳比分别为2和1时，积炭产生的温度为680K~850K，并在785K达到积炭质量分数的最大值为0.66%，此时甲烷转化率和氢气质量含量分别为53.43%和2.37%；且消碳对应的空碳比和水碳比分别约为2.4和1.1。

Thermodynamic analysis of carbon deposition for methane reforming at low temperature in micro-combustor

Carbon deposition caused by reforming in micro-combustor brings catalyst deactivation and channel snarl-up.The technology of methane wet-air autothermal reforming is presented to realize methane last,steady-state combustion and to reduce carbon deposition.The effects for carbon deposition below 973 K are discussed by thermodynamic analysis at 0.1 MPa in this paper.Results show that temperature,air-methane ratio and steam-methane ratio contribute a lot to the carbon deposition.In micro-combustor,carbon depos...